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Finding the Fourth Proportional to 1,142.99, 1,577.31 and 619.02

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Solution

The fourth proportional to 1,142.99, 1,577.31 and 619.02 is: 854.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.99 : 1,577.31 = 619.02 : x
  2. Step 2: Convert to fraction form
    1,142.99/1,577.31 = 619.02/x
  3. Step 3: Cross multiply
    1,142.99x = 1,577.31 × 619.02
  4. Step 4: Simplify right side
    1,142.99x = 976,386.44
  5. Step 5: Solve for x
    x = 976,386.44/1,142.99
  6. Step 6: Final answer
    x = 854.24

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.